JPH05325116A - Tape recorder - Google Patents

Abstract

PURPOSE:To obtain a tap recorder equipped with independent recording and reproducing heads in which tracking recording is realized with no timing shift by temporarily decelerating the tape speed upon designation of recording during reproducing operation thereby correcting the shift of record target point. CONSTITUTION:Upon provision of a recording command from an operating section 11 during reproduction of a magnetic tap 1 through a reproduction head 3 provided independently while being spaced apart from a recording head 4, a capstan motor drive 4 is controlled by means of a system controller 10. Traveling speed of a tape 1 is thereby decelerated temporarily and the shift from a record target point caused by the span between the heads 3, 4 is corrected resulting in tracking recording having no timing shift due to the span between the recording and reproducing heads.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recorder provided with a reproducing head and a recording head separately.

[0002]

2. Description of the Related Art For example, in a tape recorder capable of recording and reproducing on a compact cassette tape, a two-head type having a recording / reproducing head and an erasing head, a recording-only head, a reproduction-only head, and an erasing head A three-head type having a head is known.

The two-head type has an advantage that the structure of the head device is simplified and the cost is low, while the three-head type has an advantage that the sound quality can be generally improved as compared with the two-head type. ..

[0004]

By the way, in a tape recorder, while playing a magnetic tape, the user switches to recording at the timing and records the desired sound almost continuously on the magnetic tape, so-called chase recording. There is a case where a recording called (or a connection recording) is performed, and such a recording operation is performed by, for example, a recorded reading voice,
It is executed when a conversation voice or the like is partially modified or added, or when a musical instrument performance sound is modified or added. In case of 2 head type,
This type of chase recording does not cause any particular inconvenience, but in the case of the 3-head type, the position on the magnetic tape is exactly the same as the user's timing due to the positional deviation between the reproducing head and the recording head when performing chase recording. There is a problem that voice is not recorded.

This will be described with reference to FIGS. 6 and 7. FIG. 6 shows a case of a two-head type, in which the magnetic tape 1 travels in the direction of arrow P, so that the recording / playback head 2 fixed to the head device portion is relatively displaced in the direction of arrow Q on the tape. To go. 2t indicates a recording / reproducing head in a position state after a lapse of T time from the time of passing the point C. For the sake of explanation, it is assumed that a certain rhythm sound is recorded at points A, B, and C on the magnetic tape 1, for example. The distances from the points A to B and the points B to C on the magnetic tape 1 are T _0, that is, a rhythm sound of a certain constant speed is recorded up to the point C.

At this time, when subsequently recording a rhythm sound at the same timing (that is, at the point D), the user rewinds the tape to a certain extent from the point C, performs a reproducing operation, and A, B, C While listening to the rhythm sound at each point, the timing was measured, and the recording operation was performed immediately after the recording / playback head 2 passed through the point C to put the tape recorder in the recording mode, and the position of the recording / playback head 2 was set at the point D (recording / playback head 2).
The rhythm sound is input at the timing when it is estimated that t) has come. As a result, a certain rhythm sound is chased and recorded.

However, if the same follow-up recording is attempted to be performed by a three-head type tape recorder, follow-up recording cannot be performed at the timing that is estimated. That is, as shown in FIG.
When the point is played back, the timing is adjusted by the played rhythm sound, and immediately after that, the recording mode is switched to record at the point D, the playback head 3 is actually located at the point D when the user actually inputs the sound. It has reached the timing (playback head 3t), at which time the recording head 4 has advanced to point Dx (recording head 4t).
t). Therefore, the rhythm sound is recorded at the point Dx, which is displaced from the point D by the distance Wt, and when this is reproduced,
The user will feel a timing lag.

It should be noted that the amount of deviation time is ± 30 due to human perception.
There is almost no timing deviation within m seconds, but in actuality as a 3-head type tape recorder for compact cassette tapes, the separation distance between the recording head and the reproduction head is about 4 mm. Since the time amount of the generated timing deviation is about 90 msec, the timing deviation at the time of the chase recording is quite clearly recognized.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to eliminate the discrepancy in the recording timing caused by the follow-up recording in a three-head type tape recorder. The control means for executing the running control of the tape-shaped recording medium, when the recording instruction is given during reproduction, is the deviation amount of the recording target point on the tape-shaped recording medium caused by the distance between the reproducing head and the recording head. In order to correct the above, the control is performed so that the tape traveling speed is temporarily decelerated, accelerated, or stopped.

[0010]

By changing the tape running speed immediately after the reproduction mode is switched to the recording mode, it is possible to correct the deviation of the recording timing due to the distance between the recording head and the reproducing head. For example, as compared with the case of FIG. 7, when the reproducing head 3 is switched to the recording mode immediately after passing through the point C, the tape traveling speed is temporarily reduced to reduce the tape traveling amount. As described above, if the traveling speed is constant, the recording head 4 can be adjusted to reach the point D (recording head 4t) at the timing when the reproducing head 3 reaches the point D.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.
The structure of the essential part of the tape recorder of the embodiment using a compact cassette tape as a recording medium is shown in FIG. 2, and 10 is a system controller composed of a microcomputer. The system controller 10 is composed of various operation keys and an encoding unit for key input information. The operation information from the operation unit 11 serving as an operation input unit for the user, a tape end / top detection signal, a cassette presence / absence detection signal, no recording, a cap The entire operation of the tape recorder is controlled based on the detection signal of the stun FG or the like.

Reference numeral 12 is a plunger drive circuit, 13 is a reel motor drive circuit, and 14 is a capstan motor drive circuit. Based on control signals from the system controller 10, the brake plunger 15 and the reel motor 1 respectively.
6. The drive voltage is output to the capstan motor 17. The rotational driving force from the capstan motor 17 is transmitted to the capstan 19 via the flywheel 18, and the pinch roller 20 causes the magnetic tape 1 pressed against the capstan 19 to run at a constant speed.

Reference numeral 21 is a recording signal processing circuit, which has a terminal 22.
The audio signal input from the recording head 4 is subjected to processing such as amplification, equalizing, and noise reduction.
Supply to. Reference numeral 23 is a reproduction signal processing circuit, which performs processing such as amplification and equalization on the audio signal read from the magnetic tape 1 by the reproduction head 3, and then supplies the audio signal from a terminal 24 to an audio output unit such as a speaker. ..

FIG. 1 is a flow chart showing the control operation executed by the system controller 10 in such a tape recorder in response to the chase recording. This processing will be described with reference to FIGS. In FIG. 4, FIG.
Similar to FIG. 7, it shows a case where a rhythm sound is recorded at points A, B, and C, and a rhythm sound is chased and recorded at point D. The user reproduces the point up to point C and sets the timing. An example is shown in which the tape recorder is switched to the recording operation by the operation of the operation unit 11 immediately after the measurement, and the voice is input at the timing when the head position becomes the point D.

In the system controller 10, such follow-up recording is recognized as a case where a recording instruction is given while the vehicle is traveling at a constant speed and is in the reproducing operation (F101 → F102 → F103 → F104). ).

When the reproducing head 3 reaches the point C on the magnetic tape 1 as shown in FIG. 4 at time t ₀ in FIG. 3, and the user performs an operation for switching from the reproducing operation to the recording operation at time t ₁ as a chase recording. To do. Then, the system controller 10 performs the processing for starting the chase recording (F10
Four). First, muting control is performed on the recording processing circuit unit 21 so that noise generated by the influence of the mechanics and the operation on the electric circuit when switching from the reproduction mode to the recording mode is not recorded, and then the recording mode is switched to.

At the same time, a capstan stop signal is output to the capstan motor drive circuit 14. Furthermore, FIG.
As shown in (a), the stop flag is set, and a timer is set to obtain the timing of clearing the stop flag, and counting is started. It should be noted that the time count of the timer may be incremented by decrementing the set value for each interrupt processing in an interrupt processing routine that occurs every predetermined period, and when the count value = 0.

A capstan motor drive circuit 1 supplied with a capstan stop signal from the system controller 10.
4, accordingly stops the supply of the drive voltage to the capstan motor. However, due to the inertia of the flywheel 18 and the like, the rotation of the capstan 19 does not actually stop immediately, so that the tape speed gradually decreases from the time point t ₁ as shown in FIG. 3D. Become.

After passing through step F104, since the system is in the recording mode, the process proceeds from step F102 to F105, and it is judged whether the stop flag is on or off. At this time,
Since the stop flag is on, the count value of the timer is subsequently determined (F106). This operation is continued until the time is up. For example, if the time t _{2 in} FIG. 3 is the time up of the timer, the system controller 10 determines the time t ₂
At this time, the stop flag is turned off, and a capstan start signal is supplied to the capstan motor drive circuit 14. Further, as shown in FIG. 4B, the activation flag is set, the timer is set to obtain the timing of clearing the activation flag, and counting is started (F107).

A capstan motor drive circuit 1 to which a capstan start signal is supplied from the system controller 10.
In response to this, 4 starts supplying the drive voltage to the capstan motor. Therefore, the tape speed is gradually accelerated from the time point t ₂ as shown in FIG.
It will return to (4.76 cm / sec).

After passing through step F107, since the system is in the recording mode, the process proceeds from step F102 to F105, and since the stop flag is off, the process proceeds to F108 to determine whether the start flag is on / off. .. At this time, since the activation flag is on, the count value of the timer is subsequently determined (F109). The count-up value of the timer for the activation flag is set to a time sufficient for the capstan 19 to return to the constant rotation speed, and for example, t in FIG.
Time is up at ₃ points.

The system controller 10 carries out step F109.
In at t ₃ when it is a time-up, the process proceeds to step F110, and turns off the start flag, and outputs a control signal to turn off the muting process on the recording signal processing circuit 21 at the same time. Therefore, after the time point t ₃ , by inputting voice to the terminal 22, the voice signal is supplied to the recording head 4 via the recording signal processing circuit 21, and the voice signal is actually recorded on the magnetic tape 1. It will be.

Here, assuming that the time corresponding to the distance T ₀ from the point C to the point D on the tape in FIG. 4 is from time t _{0 to} t ₄ in FIG. 3, the tape running speed before time t _3. Since the tape is temporarily decelerated, the tape running amount is reduced. Therefore, the reproducing head 3 and the recording head 4 are placed on the magnetic tape 1 at 3t and 4t in FIG.
Has only reached the position.

That is, by this temporary deceleration processing, the tape running amount is reduced by about 90 msec as compared with the case of FIG. 7, so that the reproducing head 3 is not used at the timing when the user sees the point as D. It is the timing when the recording head 4 reaches the point D. Therefore, the rhythm sound at the time of the follow-up recording is recorded at the point D, which is a substantially good timing position, and the deviation of the recording timing caused by the distance between the recording head 4 and the reproducing head 3 is eliminated.

The deceleration period and the time t when the recording is started
_{Since the} amount of decrease in the tape running amount is set by the set times of the stop flag timer and the start flag timer for determining the timings of ₂ and time t ₃ , these are the capstans depending on the size of the flywheel 19. Should be calculated so that the tape running amount can be reduced by about 90 msec based on the deceleration state, the rising time to the constant speed at the time of startup, and the like. Actually, the tape running amount decrease is set to about 60 to 120 msec, and if the shift amount can be set to, for example, about ± 25 msec, the user can hardly feel the shift in the recording timing. be able to.

Further, it is preferable that the timing of the recording start time t ₃ is as early as possible after the capstan 19 recovers to a constant speed so as not to deteriorate the recording operation response.

FIG. 5 shows another embodiment, which can be applied to a tape recorder having a relatively small flywheel and a tape recorder which requires a short time to start the capstan at a constant speed due to motor performance. Similar to FIG. 3, when the chase recording operation is performed at the time point t ₁ , the capstan stop control is performed and the deceleration is continued until the time point t ₃ as shown in FIG. 5B, for example. Then, the capstan activation control is performed at the time t ₃ when the muting is released and the recording is enabled. In this embodiment, the timing control at the time point t ₂ is unnecessary as compared with the above example, so that the control becomes easier.

By the way, when the distance between the recording head and the reproducing head is large as in a tape recorder corresponding to an open reel tape or the tape running speed is different, the tape running speed is temporarily changed as in the above embodiment. Instead of deceleration, it is also possible to use the brake plunger to temporarily stop the capstan and restart it immediately thereafter.

Furthermore, when the positional relationship between the recording head and the reproducing head with respect to the tape running direction is opposite to that in the above-mentioned embodiment and the recording voice is deviated in the direction in which the timing becomes faster during the chase recording, the tape running speed is To temporarily accelerate the
The amount of travel should be increased.

[0030]

As described above, the tape recorder of the present invention temporarily changes the tape running speed during chasing recording to adjust the tape running amount, thereby separating the recording head from the reproducing head. There is an effect that the deviation of the recording timing based on the above is eliminated, and various follow-up recordings such as reading, conversation, performance music, etc. can be satisfactorily executed by using a high-quality three-head type tape recorder.

[Brief description of drawings]

FIG. 1 is a flowchart illustrating a control operation according to an embodiment of the present invention.

FIG. 2 is a block diagram of a main part of the embodiment.

FIG. 3 is an explanatory diagram of control timing at the time of chase recording according to the embodiment.

FIG. 4 is an explanatory diagram of a head position at the time of chase recording according to the embodiment.

FIG. 5 is an explanatory diagram of control timing at the time of follow-up recording according to another embodiment of the present invention.

FIG. 6 is an explanatory diagram of a head position at the time of follow-up recording by a two-head type.

FIG. 7 is an explanatory diagram of a head position at the time of follow-up recording by a three-head type.

[Explanation of symbols]

 1 magnetic tape 3 reproducing head 4 recording head 10 system controller 11 operation unit 14 capstan motor drive circuit 19 capstan 21 recording signal processing circuit 23 reproducing signal processing circuit

Claims (2)

[Claims] 1. A tape recorder in which a reproducing head and a recording head are provided independently of each other to perform recording and reproducing operations on a tape-shaped recording medium, the control means for executing running control of the tape-shaped recording medium. When a recording instruction is given during reproduction, the tape running speed is temporarily changed in order to correct the deviation amount of the recording target point on the tape-shaped recording medium caused by the distance between the reproducing head and the recording head. A tape recorder characterized by being capable of decelerating or accelerating. 2. In a tape recorder in which a reproducing head and a recording head are independently provided to perform recording and reproducing operations on a tape recording medium, a control means for executing running control of the tape recording medium is provided. When the recording instruction is given during reproduction, the tape running is temporarily stopped to correct the amount of deviation of the recording target point on the tape-shaped recording medium caused by the distance between the reproducing head and the recording head. A tape recorder characterized in that it can be done.